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Cover caption:

Front cover caption: Top: a single colony of Gluconacetobacter diazotrophicus. Bottom: a series of images of a single G. diazotrophicus colony over several days of development (from left to right: 4, 5, 6 and 7 days). Photographs courtesy B. Luit and J. K. Vessey, University of Manitoba, Winnipeg, Canada. See the paper by Dong et al. on pp. 2293-2298.